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Induced crystallization step-by-step softening method and system

A technology of inducing crystallization and crystallization, which is applied in the field of water treatment, can solve the problems of membrane system clogging, hardness reduction, particle fragility, etc., and achieve the effect of saving disposal costs

Active Publication Date: 2021-06-01
国电建投内蒙古能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when desulfurization wastewater with a high concentration of Mg2+ induces crystallization of CaCO3 crystals, it is easy to produce Mg2+ co-precipitation, making CaCO3The hardness of the crystal is reduced, the particles are fragile, and the magnesium-containing suspended matter produced will cause a high concentration of suspended solids in the effluent, resulting in blockage of the subsequent membrane system. Therefore, it is often necessary to add tubular membrane groups afterwards to filter the Magnesium suspension
At the same time, CaCO3 crystals are generally imported into the desulfurization tower for blending and burning, which cannot produce economic value

Method used

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  • Induced crystallization step-by-step softening method and system
  • Induced crystallization step-by-step softening method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a step-by-step softening method of induced crystallization comprises the following steps:

[0043] S1. High-magnesium desulfurization wastewater enters the regulating pool 1;

[0044] S2. The waste water enters the primary granulation system 2, fills the primary granulation system 2 with the first seed material, pumps water upwards to keep the granule bed in a fluidized state, and adjusts the pH of the primary granulation system 2 to 8-9.5 Between, using the induced crystallization method to make the HCO in the wastewater 3 - and CO 3 2- Ionic crystallization gives CaCO 3 Crystallization and wastewater A;

[0045] S3. The waste water A flows into the heat exchange system 3 for heating;

[0046] S4. The heated waste water A flows into the secondary granulation system 4, fills the secondary granulation system 4 with the second seed crystal material and pumps water upwards to keep the granule bed in a fluidized state, and adjusts the pH of...

Embodiment 2

[0051] Such as figure 1 As shown, a step-by-step softening method of induced crystallization comprises the following steps:

[0052] S1. The high-magnesium desulfurization wastewater passes through the regulating tank 1;

[0053] S2. The waste water enters the primary granulation system 2, and the primary granulation system 2 is filled with quartz sand or garnet or calcium carbonate or aragonite or dolomite as a seed material, and then pumps water upward to keep the granule bed fluidized State, add NaOH or Na 2 CO 3 Adjust the pH of the primary granulation system 2 to between 8 and 9.5, and use the induced crystallization method to make the HCO in the influent 3 - and CO 3 2- Ionic crystallization gives CaCO 3 Crystallization and wastewater A;

[0054] S3. The waste water A flows into the heat exchange system 3 and is heated to 35-95°C;

[0055] S4. The heated waste water A flows into the secondary granulation system 4, fills the secondary granulation system 4 with qu...

Embodiment 3

[0060] Such as figure 1 As shown, a step-by-step softening method of induced crystallization comprises the following steps:

[0061] S1. The high-magnesium desulfurization wastewater passes through the regulating tank 1;

[0062] S2. The waste water enters the primary granulation system 2, and the primary granulation system 2 is filled with quartz sand or garnet or calcium carbonate or aragonite or dolomite as a seed material, and then pumps water upward to keep the granule bed fluidized State, add NaOH or Na 2 CO 3 Adjust the pH of the primary granulation system 2 to between 8 and 9.5; when the concentration of bicarbonate ions in the waste water is low, add calcium ions to bicarbonate ions at a ratio of 1:1 to 1:1.5 Grade granulation system (2) adds carbonate to supplement CO 3 2- ions; using induced crystallization method to make the HCO in the influent 3 - and CO 3 2- Ionic crystallization gives CaCO 3 Crystallization and wastewater A;

[0063] S3. The waste wat...

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Abstract

The invention provides an induced crystallization step-by-step softening method and system. The system comprises an adjusting tank (1), a first-stage granulation system (2), a heat exchange system (3), a second-stage granulation system (4), a security filter device (5) and a wastewater decrement concentration system (6) which are connected in sequence, wherein the first-stage granulation system (2) and the second-stage granulation system (4) are both circulating fluidized-bed devices. According to the method, high-magnesium desulfurization wastewater is softened step by step through the two-stage series induced crystallization granulation system, CaCO3 crystals are recycled firstly, then flue gas or waste steam in a plant is used for heating the high-magnesium desulfurization wastewater, and softening is further conducted so as to obtain Mg(OH)2 crystals with high commodity value. According to the method and the system, the high-magnesium desulfurization wastewater can be softened, the CaCO3 crystals and the Mg(OH)2 crystals can be obtained, double alkali does not need to be added in a softening process, treatment cost is saved, high-water-content sludge is not generated, the softened water only needs to be filtered by a cartridge filter, a high-density pool or a tubular membrane filtering system does not need to be used, and remarkable economic effect is obtained.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a step-by-step softening method and system for inducing crystallization. Background technique [0002] In recent years, thermal power plants, as large water consumers, have experienced a sharp increase in water resource constraints and discharge restrictions. In my country's energy structure, coal will be my country's main energy source for a long time, and the dominant position in the power supply pattern of coal-fired power stations will not change in the short term. However, in some power plants in the northern region, such as Inner Mongolia Dongsheng Power Plant, Xingyang Power Plant, Shandong Zouping Power Plant Lanzhou Power Plant, etc., due to the coal type and desulfurization limestone used, Mg in desulfurization wastewater 2+ The concentration is as high as 5000-10000mg / L. If this type of wastewater is treated with membrane salt separation technology, there will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F5/14C01F11/18C02F5/02C02F1/66C02F1/52C02F103/18
CPCC02F9/00C02F5/02C02F1/66C01F5/14C01F11/18C02F2103/18C02F2209/055C02F2001/5218
Inventor 王江湖陆梦楠刘伟雄朱振武王洪光陈淑云范增伟陈小峰庞东光吕琳王一男赵焰郭旭涛张玉魁李泽徐志清
Owner 国电建投内蒙古能源有限公司